PluginChecker OS X Dock Icons madness


I am searching for a solution for the pluginchecker OS X problem, where you get a gazillion of WL dock icons.
How can I close them all at once?
Why does WL continue to produce the error?


A pluginchecker is a small program that runs to check the properties of a plugin. It is meant to run and quit automatically. If it does not quit, that should mean the plugin is not responding for some reason (hanging).
If you see hanging plugincheckers, you can close them.

Yes sure, but how can I close them all at once?